#link_a{
    font-size: xx-large;
    font-family: "微软雅黑";
    color: blue;
    border-bottom: 1px solid #000000;
}

.content_div{
    position: absolute;
    left:50%;
    top:50%;
    transform: translate(-50%, -50%);
}

.container{
    text-align: center;
}

body{
    text-align: center
}

.content_div_tip{
    position: absolute;
    left:20%;
    top:48%;
    transform: translate(-50%, -50%);
}

.tip_container{
    vertical-align: bottom;
    text-align: center;
}

.tip_msg {
    font-size: large;
    font-family: "幼圆";
    color: orange;
}